Well, the mechanism was first used by Schaible for their sink faucets in the 50s, then Sears adopted it for their Lady Kenmore line, later American Standard used it on their first "control tower" sinks, (which then became a disaster), and finally it wound up in the push/pull line of bathroom faucets in the 60s. The problem with the design is that the handle turns the faucet on, but springs have to turn it off and if the spring or stem gets stuck on something, there is NOTHING in the universe that is going to turn it off until you take it apart. My boss's doctor had a Shaible faucet in his kitchen on the North side of Chicago and we were in the South suburbs. Every so often, until I got fed up and changed the faucet, it would stick and I had to go up there and "unstick" it. Someone was making a "Moen" style retrofit "front end" for the push/pull but I have not seen it for years.